Our universe is 3-dimensional because of the way spacetime is structured in our reality. In physics, there are three spatial dimensions (length, width, and height) and one time dimension that together make up the 4-dimensional spacetime in which we exist.
The question of why our universe is 3D as opposed to 4D or higher dimensions is not fully understood, but some theories suggest that the extra dimensions beyond the three that we experience are either too small to detect or are somehow curled up or compactified in a way that prevents us from perceiving them. Additionally, our physical existence and perception as 3-dimensional beings may limit our ability to fully understand or experience higher-dimensional realities.
In summary, our universe appears to be 3D due to the specific way in which spacetime is constructed, and the reasons for why it is not 4D or higher dimensions are still a subject of scientific inquiry and speculation.
Why is our universe 3d and not 4d
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